Question

please answer . with explanation​

Answer 1

Answer:

42 cm= 0.42 m

120 cm = 0.12 m

Area covered in one rotation = curved suface area of cylinder =

$2\pi \: rh$

=2×3.14×0.42/2×0.12

=2×3.14×0.21×0.12

=0.158256m^2

area covered in 500 rounds =0.158256×500

=79.128m^2